Remove reliance on Babel.

test/eip20/eip20.js

@@ -1,4 +1,5 @@
-import assertRevert from '../helpers/assertRevert';
+// import assertRevert from '../helpers/assertRevert';
+const { assertRevert } = require('../helpers/assertRevert');
 
 const EIP20Abstraction = artifacts.require('EIP20');
 let HST;

test/helpers/assertRevert.js

@@ -1,9 +1,11 @@
-export default async (promise) => {
-  try {
-    await promise;
-    assert.fail('Expected revert not received');
-  } catch (error) {
-    const revertFound = error.message.search('revert') >= 0;
-    assert(revertFound, `Expected "revert", got ${error} instead`);
-  }
+module.exports = {
+  assertRevert: async (promise) => {
+    try {
+      await promise;
+      assert.fail('Expected revert not received');
+    } catch (error) {
+      const revertFound = error.message.search('revert') >= 0;
+      assert(revertFound, `Expected "revert", got ${error} instead`);
+    }
+  },
 };